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Subject:	Re: Odd, is it not? mkdir 'e:\' cannot be undone by rmdir 'e:\' ...
To:	cygwin AT cygwin DOT com
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From:	Eric Blake <eblake AT redhat DOT com>
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Date:	Wed, 28 Aug 2019 08:33:05 -0500
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From: Eric Blake <eblake AT redhat DOT com>
To: cygwin AT cygwin DOT com
Message-ID: <27047198-dba4-091b-8235-fc9150b68fbe AT redhat DOT com>
Subject: Re: Odd, is it not? mkdir 'e:\' cannot be undone by rmdir 'e:\' ...
References: <bc3df101ab93c20b86c3ab7fa7d3ea4f AT xs4all DOT nl>
In-Reply-To: <bc3df101ab93c20b86c3ab7fa7d3ea4f AT xs4all DOT nl>


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On 8/27/19 7:51 AM, Houder wrote:

>=20
> 64-@@ mkdir 'e:\' # creates subdirectory e: !!!!!

Had you typed:

mkdir 'e:/'

I would expect subdirectory ./e: to  be created.  But with 'e:\', that
is a DOS style path, so I would lean towards requiring './e:\' if you
want to create a literal directory named 'e:\', but without the leading
./ to merely treat 'e:\' as the drive letter and failing with EEXIST
because /cygdrive/e already exists.

So it sounds like mkdir() could be further improved when something ends
in \ rather than in /.  (The behavior when ending in / should not be
changed, though).

> 64-@@ rmdir 'e:\' # fails, because it refers to /drv/e
> rmdir: failed to remove 'e:\': Directory not empty

That matches what I would expect - because you did not pass a leading
'./', but used a backslash, you used a DOS style path and should be
attempting to act on /cygdrive/e.

>=20
> 64-@@ rmdir 'e:'

This, however, is not a DOS path, so it should prefer to act on './e:'
if that exists (and only if it does not exist, then we might consider
ALSO seeing if /cygdrive/e exists before giving up completely).

>=20
> Yes, I should NOT use "DOS paths" ...
>=20
> =C2=A0=C2=A0=C2=A0 https://cygwin.com/cygwin-ug-net/using.html#pathnames-=
win32
>=20
> However, I wonder why e:\ is interpreted by mkdir as e:, and as
> /drv/e (that is as e:\) by rmdir.

mkdir 'e:/' is supposed to be identical to mkdir 'e:'.  The problem is
that because we interchange \ with / in a number of places, we have
accidentally ended up with mkdir 'e:\' behaving like mkdir 'e:/' instead
of acting on the DOS path.

Patches welcome.

--=20
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3226
Virtualization:  qemu.org | libvirt.org


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